摘要
以位于青海和西藏两省内的青藏高原牧区为研究区域,利用新一代卫星遥感数据TERRA/MODIS,统计分析不同草地类型2002-2008年的植被指数(MODIS-EVI)时空变化特征,并结合2006年8月地面实测数据,研究草地植被指数与草地覆盖度、草群高度的关系。结果表明,草地覆盖度和草群高度均与EVI呈高度正相关。各种草地类型的植被指数均呈先上升后下降的趋势,符合自然条件下植被的生长变化情况,植被特征相近的草地类型EVI差异较小,体现出不同草地类型地域上的连续性、过渡性和时空上的差异性。
The new generation of satellite remote sensing data of Terra/MODIS from 2002 to 2008 was applied to determine the temporal and spatial change characteristics of the EVI（Enhanced Vegetation Index） in the pastoral region of Qinghai-Tibetan Plateau.Based on field data in August 2006,the relationship between EVI and cover and height was discussed in this study.The results of this study indicated that the EVI was positively related to grassland cover and height,and those of different grassland types firstly increased,and then decreased,which were consistent with the natural changes of plant growth.The EVI showed a small difference between the different grassland types when these grassland types shared the similar characteristics,implying that different grassland types not only had the continuity and transitivity in different region,but also had the differences of different grassland types.
出处
《草业科学》
CAS
CSCD
北大核心
2011年第6期1106-1116,共11页
Pratacultural Science
基金
中央高校基本科研费小额探索项目(lzujbky-2009-106)
教育部科技创新工程重大项目培育资金项目(#708089)
